diff --git a/packages/backend/src/server/ActivityPubServerService.ts b/packages/backend/src/server/ActivityPubServerService.ts
index 8d86e63ecd..8d52cf27e6 100644
--- a/packages/backend/src/server/ActivityPubServerService.ts
+++ b/packages/backend/src/server/ActivityPubServerService.ts
@@ -173,7 +173,7 @@ export class ActivityPubServerService {
 			return true;
 		}
 
-		if (this.utilityService.isFederationAllowedHost(keyHost)) {
+		if (!this.utilityService.isFederationAllowedHost(keyHost)) {
 			/* blocked instance: refuse (we don't care if the signature is
 				 good, if they even pretend to be from a blocked instance,
 				 they're out) */
diff --git a/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts b/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts
index f079ab608d..2b4885a194 100644
--- a/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts
+++ b/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts
@@ -156,7 +156,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				if (note.user?.isSilenced && me && followings && note.userId !== me.id && !followings[note.userId]) return false;
 				if (note.user?.isSuspended) return false;
 				if (note.userHost) {
-					if (this.utilityService.isFederationAllowedHost(note.userHost)) return false;
+					if (!this.utilityService.isFederationAllowedHost(note.userHost)) return false;
 					if (this.utilityService.isSilencedHost(this.serverSettings.silencedHosts, note.userHost)) return false;
 				}
 				return true;